Lin-Manuel Miranda working on new Little Mermaid music with Alan Menken

Lin-Manuel Miranda will be doing more than just wearing the “don’t mess it up hat” on Disney’s live-action take on The Little Mermaid.

Veteran Disney composer Alan Menken officially confirmed at D23 Expo that Miranda will be collaborating with him on new music for the film, which is to re-imagine the studio’s 1989 animated classic. “For the live-action Little Mermaid, I’m writing additional songs with lyrics by Hamilton and Moana songwriter Lin-Manuel Miranda,” he said.

A lifelong Disney fan — not to mention a Broadway sensation and a MacArthur fellow — Miranda first boarded The Little Mermaida year ago, but details about his creative duties proved elusive.

Back in November, Miranda told Vulture, “I literally don’t have a title for what my job on The Little Mermaid is yet. Right now, it’s the guy who wears the ‘don’t mess it up’ hat. If I could sign a contract with that job title on it, that would be great!”

Miranda is fast becoming a fixture at Disney. In addition to his off-screen work on Moana and The Little Mermaid, he’s costarring with Emily Blunt in Mary Poppins Returns.